Tracing appliance for pairs of measuring pictures



Oct. 13, 1931. R. HUGERSHOFF 1,827,473

I TRACING APPLIANCE FOR PAIRS OF MEASURING PICTURES Filed Aug. 30, 1929 2 Sheets-Sheet 1 //7 van fol:

Oct. 13, 1931. R. HUGERSHOFF 1,327,473

TRACING APPLIANCE FOR PAIRS OF MEASURING PICTURES Filed Aug. 50, 1929 2 Sheets-Sheet 2 In venfo/z- "Patented Oct. 13, 193. '1

REINHARD fnu EnsnoFF, or nnnsnniv, G nnAiv assienon To .Tii'E FIRM IKARUS- "INTERNATIONALE- :PATENTVERWERTUNGS AKTIEN-IGESELLSGHAFT, or VADUZ,

; LIECHTENSTEIN mammals-MAM s i wear agnumm mas a ap lication fi led August 30,-1e29, Serial N assess/ nd in Germany"se tmbr io; 1 928 a a This invention relates to the construct-ion V of a mirror stereoscope of the Helmholtz type for measuring purposes; For the ad]ust1ng V of any de'siredypoints ofthe space model ob tained fromthe considerationof the two in- ,dividual views arranged-in one plane there are employed in a known manner'two real measuring marks connected =with, one another, 'one 'of-which slide-s directlyover' the 1 1 left-hand image plane'andfthe'otherover the right-handimage plane. a v Now the invention consists firstly-in the *fact that the two measuring marks, the distance apartof, which isadjustable, are rigid- :ly connected with an iinpleme'nt, moreparti c'ularly a recording stylus, and v are moved 7 with it by' means of aparallel" motion, for

instance a cross slide, to be actuated directly by hand, always in such afway'that the line- 2;) joining'the two measuring marks remains parallel to itself. The implement, in partlcu-I I lar the recording stylus, then slidesover a drawing surface, the plane of whichjis par-ah.

Y lel to the common plane' ofthe two measuring picture's. i l I If with such a device, for j instance when looking at aerialmeasuring; photographs taken vertically at thesame height, the space. mark appearing at a definite apparentdepth,

39 with adefinite distance between the two real measuring marks, is moved along the space model,the pencil will draw the layer line corresponding in 'perspective'to this depth; In

order to give rise to the spatial impression in photograph's'which have been taken from aircraft havingralateraldrift, the two par t ial pic'tureg areso arranged in theirplane as to be rotatable at'will in'a'known manner. If the real measuring marksa'rethen pro- 4o 'vided ontheirunderiside with suitable graving tools or similar devices, the perspective layer lines traversed canrbe fixed therewith upon the layer of the'measunng 'plctures and piecesof different-focal lengths in. which the made continuously visible as spatial structures in the'space image.

"with 'photographs taken inatruly vertical 7 direction and with a horizontal basis a per- -eog'spfectivedisplacement of the layer lines is'0b-:

tained and an increasing scale 'withfincreasmg height of 'portions of'the surface of the land. For the exact dimensioning of the groundglass screens are provided in the measuring;pictures according to the process ndicated, aCC'O I'Cl'Hlg tO the present lnvention image planes of'the mirror stereoscope, and V upon thesescreens themeasuring pictures are projected from the back; The projecting appliances to be employed for this :purposemust be tiltable and adjustable in space at will in a known mannerrelatively to the correspondmake the entire apparatus light andeasy to 'handle, instead of the original p'hotograph's reductions thereof arepreferably employed for the pro ection. In-the case of the method of using the appliancejust described,*the-*ad justing of the distances betweenfdifierent layer lines is obviously no longer effected by altering the distance between the two-f real Y measuring marks but by moving the project:

"ing apparatus nearer to or farther from the projection surfaces. j v Q The adapting of sequence pictures to apair of plates already oriented relatively tothe .horizon'tal may be faoilitatedaccording to the invention by completely removing-the entire inspection stereo scope; serving for look-V ing at the photographs and consisting; infthe 'H8lII1hOliZ type of four rigidly arranged mirrors and two eye pieces, with whichtheleftv I hand photograph ispresentedto'theleft eye and theright-jhand photograph to the right eye, and substituting for. another inspection stereoscop c, which likewise consists of four rigidly arranged mirrorsand two. eye

left-hand picture is'now presented'to the L right eye I and the right-hand picture to the left eye.

One constructional example of rthe inventionis illustratedin the accompanyingdra-wings in'which:

Figure 1 shows a front elevation of the appliance,

Fig. 2 is a section through a mirror box which serves for viewing the picture surfaces or measuring marks in the appliance shown in Fig. 1,

Fig. 3 is a section through a mirror box in which the passage of the rays is laterally reversed, V Fig. 4 is a front elevation of a double projection device which is erected behind the plate holder of Figure 1 in order torenablc oriented projections to be dealt with and Fig. 5 is a plan of the device shown in Fig. 4.

The appliance shown in Fig. 1 with its holder P, is to be regarded as vertical, for the two measuring pictures B and B which can be oriented at will in rotatable supports V and V and centred by means of eccentric sheaves Z. The measuring marks M and M are fitted to the underside of transparent holders H and H the distance apart of which is regulated by a screw S. The two holders H and H admit of bein freely displaced together by hand by means of a cross slide consisting of slide rods Y and X. In this displacement a pencil W connected with the holder H positively participates, the movements of this pencil tracing a line upon a drawing surface Q.

The picture surfaces B or the measuring marks M and M are inspected by means of eye pieces 0 and O in a mirror box K, which is shown in Figure 2, but only half shown in Figure 1. The mirror box K held in guides F, and F can be changed for a mirror box K, shown in Figure 3, in which the passage of the rays is laterally reversed.

If in place of original pictures projections of such pictures oriented upon the ground glass screens lying in the image fields B and B are employed, a projection device to be erected behind the plate holder P is used, this being illustrated in front elevation in Figure 4 and in plan inv Figure 5.

A base A is vertically displaceable on a column C. The column C itself admits of being displaced at will by means of slides D and E, the slide E preferably being actuated by a fine-movement screw G, which serves for measuring height. The base body comprises devices for regulating the size and direction of the distance between the centre points of the two projector objective lenses J and J 2 of the projection chambers L and L These devices consist of an abscissa slide N, an ordinate slide R and a height slide T. The projection chambers L and L together with the measuring pictures to be inserted therein, preferably reduced in size, can be directed at will by means of drives U and U and inclined at will by means of drives U and U The twisting device for the measurlng pictures to be projected is not shown in the drawings for the sake of simplicity, nor is the illuminating means thereof.

hat I claim is:

1. A tracing device for pairs of measuring pictures, and more particularly for pairs of aerial photographs taken in a substantially Vertical direction, comprising a mirror stereoscope, inspection eyepieces, two real measuring marks connected with one an other, sliding directly over the image plane and displaceable independently of the inspection eyepieces, means for regulating the distance between the measuring marks, a marking implement such as a pencil, the measuring marks being rigidly connected with the marking implementfand a parallel motion for moving the measuring marks and the marking implement collectively, to enable layer lines and situation lines to be obtained freehand and continuously from pairs of measuring pictures. j

2. A tracing device for pairs of measuring pictures, and more particularly for pairs of aerial photographs taken in a substantially vertical direction, comprising a mirror stereoscope, inspection eyepieces, a marking implement such as a pencil, two real measuring marks connected with one another, sliding directly over the image plane and displaceable independently of the inspection eyepieces, the measuring marks being rigidly connected with the marking implement,

means for regulating the distance between the measuring marks, a double pro ector. connected with the mirror stereoscope and 1 adapted to project self-oriented images of the measuring pictures into the plane of the measuring marks, to be measured in place of the original pictures, and a parallel motion for moving the measuring marks and the marking implement collectively, to enable layer lines and situation lines to be obtained freehand and continuously from pairs of measuring pictures.

A tracing device for pairs of measuring pictures, and more particularly for pairs of aerial photographs taken in a substantially Vertical direction, comprising a mirror stereoscope consisting of four rigidly arranged mirrors and two. eyepieces of difl:er ent focal lengths, a marking implement such as a pencil, two real measuring marks connected with one another, sliding directly over the image plane and displaceable independently of the inspection eyepieces, the measuring marks being rigidly connected with the marking implement, means for regulating the distance between the measuring marks, and a parallel motion for moving the measuring marks and the marking 1mplement collectively, to enable layer lines and situation lines to be obtained freehand and continuously from pairs of measuring pictures. 4:. A tracing device for pairs of measuring pictures, and more particularly for pairs of I aerial photographs taken in a substantially comprising a mirror ,stereoscop'e consisting of four rigidly arg ranged mirrors and two eyepieces of differ .ent focal lengths, a'marking implement such vertical direction,

as a pencil, two real measuring'marks connected with one another, sliding directly over the imageplane and displaceable independently of the inspection eyepieces, the measuring marks being rigidly connected with the marking implement, means for regulating the distance between the measuring marks, a double projector connected With the-mirror stereoscope and adapted to project self-oriented images of the measuring pictures into the plane-of the measuring marks, to be measured in place of the original pictures, and a parallel, motion for moving the measuring marks and the marking im-.

plement collectively, to enable layer lines and V situation lines to be obtained freehand and continuously from pairs of measuring pictures.

In testimony whereof I have signed my name to this specification.

, REINHARD HUGERSHOFF. 

